Read e-book online A College Course on Relativity and Cosmology PDF

By Ta-Pei Cheng

ISBN-10: 0199693404

ISBN-13: 9780199693405

This complex undergraduate textual content introduces Einstein's common idea of relativity. the subjects coated comprise geometric formula of targeted relativity, the main of equivalence, Einstein's box equation and its spherical-symmetric resolution, in addition to cosmology. An emphasis is put on actual examples and easy purposes with out the whole tensor equipment. It starts via interpreting the physics of the equivalence precept and appears at the way it encouraged Einstein's notion of curved spacetime because the gravitational box. At a extra mathematically obtainable point, it offers a metric description of a warped area, permitting the reader to check many attention-grabbing phenomena comparable to gravitational time dilation, GPS operation, mild deflection, precession of Mercury's perihelion, and black holes. a number of sleek subject matters in cosmology are mentioned from primordial inflation and cosmic microwave heritage to the darkish power that propels an accelerating universe.

Building on Cheng's past ebook, 'Relativity, Gravitation and Cosmology: A uncomplicated Introduction', this article has been adapted to the complex pupil. It concentrates at the middle components of the topic making it compatible for a one-semester direction on the undergraduate point. it might additionally function an obtainable advent of common relativity and cosmology for these readers who are looking to examine the topic all alone. the right kind tensor formula of Einstein's box equation is gifted in an appendix bankruptcy for these wishing to glimpse extra on the mathematical info.

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Additional info for A College Course on Relativity and Cosmology

Example text

A metric in general is a matrix whose diagonal elements are the magnitudes of the basis vectors and whose off-diagonal elements show their deviation from orthogonality. The metric of a space defines its inner product. • Tensors in Minkowski space are quantities having definite transformation properties under Lorentz transformation. If a physics equation can be written in tensor form (as discussed in Chapter 1), it automatically respects the relativity principle. • Tensors with no indices (scalars) are invariant under Lorentz transformation.

10 The setup is similar to that shown in Fig. 2, but with a clock fixed at a location on the rail platform. dilation shows up directly from the measurement by the most basic of clocks:9 a light-pulse clock. It ticks away the time by having a light pulse bounce back and forth between two mirror ends separated by a fixed distance d. Length contraction The phenomenon of length contraction also follows directly from the Lorentz transformation. 14): x= x . γ Because 1/γ < 1, x < x . 15). 10 Let there be a clock attached to a fixed marker on the ground.

51) where θ is the angle between the boost direction xˆ and the direction of wave ˆ Since ck = ω, we obtain the relativistic Doppler formula, propagation k. 2. 2 continued which can be compared with the nonrelativistic Doppler relation, ω = (1 – β cos θ )ω. In the nonrelativistic limit, there is no Doppler shift (ω = ω) in the transverse direction, θ = π/2, whereas the relativistic transverse Doppler relation, ω = γ ω, clearly demonstrates the relativistic time dilation. 46) for a massless particle with speed c: E/p = c = ω/k = νλ.

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A College Course on Relativity and Cosmology by Ta-Pei Cheng


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